Substrate for liquid crystal display and sealants at opening region with different hardness, manufacturing method thereof and panel

ABSTRACT

An assembled panel is provided in the present invention, the panel comprises substrate for liquid crystal display. The substrate comprises a base substrate comprising at least one individual panel region, a subsidiary sealant member provided on the periphery of the individual panel region, at least one opening region provided on the subsidiary sealant member, and a buffer provided on the base substrate between the opening region and the individual panel region and corresponding to the opening region.

BACKGROUND OF THE INVENTION

Embodiments of the present invention relate to a substrate for liquidcrystal display, a manufacturing method thereof and an assembled panel.

Recently, liquid crystal displays (LCDs) have been widely applied topersonal digital assistants (PDAs), play station portables (PSPs),global positioning systems (GPSs) and the like. Among various kinds ofliquid crystal displays, thin film transistor liquid crystal displays(TFT-LCDs) have prevailed in the market of flat panel displays due tothe advantages of low power consumption and free of radiation and thelike.

The display panel of a TFT-LCD comprises a thin film transistor (TFT)array substrate, a color filter substrate, and a liquid crystal layerinterposed therebetween. The principle based on which a TFT-LCD displaysan image is that the liquid crystal molecules in the liquid crystallayer can be rotated with the intensity of the electric field appliedthereon by the voltage applied from the driving circuit and accordinglythe alignment direction of the liquid crystal molecules are changed sothat the amount of light transmitted through the liquid crystal layer ischanged.

A conventional process of manufacturing a TFT-LCD panel generallycomprises a TFT process, a color filter process, a cell process and amodule process. The cell process can comprise four steps as follows:applying an alignment film and curing the alignment film on the surfacesof a TFT array substrate and a color filter substrate; rubbing thealignment films and forming grooves along a certain direction on thesurfaces of the alignment films so that liquid crystal molecules can bepre-aligned along the direction; assembling the TFT array substrate andthe color filter substrate with a sealant member and curing the sealantmember; and performing a cutting process on the assembled substrates toform individual panels.

In assembling, firstly liquid crystal material is dropped and sealant iscoated to form a sealant member comprising a subsidiary sealant memberand a primary sealant member, and then the TFT array substrate and thecolor filter substrate are bonded together. As shown in FIG. 1, aplurality of individual panels 14 are obtained after assembling the TFTarray substrate and the color filter substrate. The individual panel 14comprises an individual panel region of the TFT array substrate, anindividual panel region of the color filter substrate, and a liquidcrystal layer held between the two individual panel regions.

The individual panel regions of the TFT array substrate and theindividual panel regions of the color filter substrate face each otherand are equal in number. During the assembling process, liquid crystalmaterial is firstly dropped onto the individual panel regions of the TFTarray substrate or the individual panel regions of the color filtersubstrate, the primary sealant is applied along the edges of theindividual panel regions of the TFT array substrate or the color filtersubstrate, which has not the liquid crystal material dropped thereon,the subsidiary sealant is applied on the periphery of the individualpanel regions, and then the TFT array substrate and the color filtersubstrate are bonded together and the sealants are cured through lightirradiation or thermal treatment.

As shown in FIG. 2, gate lines, data lines, thin film transistors 7 andother components are provided in the individual panel regions of the TFTarray substrate, and a black matrix 9, a color filter film 8 and othercomponents are provided in the individual panel regions of the colorfilter substrate.

The panel obtained by assembling the TFT array substrate and the colorfilter substrate is cut into a plurality of individual liquid crystaldisplay panels.

Because the space between the TFT array substrate and the color filtersubstrate is vacuumed when the TFT array substrate is bonded with thecolor filter substrate under a vacuum situation and pressure in thespace is quite low, the primary sealant member 2 may be easily attackedby the airflow entering into the regions between the subsidiary sealantmember 15 and the primary sealant member 2 through the opening regions12 of the subsidiary sealant member 15 after the panel is exposed to theatmosphere. Therefore, the primary sealant member 2 is damaged or brokenand the display quality can be degraded due to the produced bubbles.

SUMMARY OF THE INVENTION

A substrate for liquid crystal display is provided in an embodiment ofthe invention. The substrate comprises a base substrate comprising atleast one individual panel region, a subsidiary sealant member providedon the periphery of the individual panel region, at least one openingregion provided on the subsidiary sealant member, and a buffer providedon the base substrate between the opening region and the individualpanel region and corresponding to the opening region.

A method of manufacturing a substrate for liquid crystal display isfurther provided in another amendment of the invention. The methodcomprises forming at least one individual panel region on a basesubstrate; forming a subsidiary sealant member on the periphery of theindividual panel region and providing at least one opening region on thesubsidiary sealant member; and forming a buffer corresponding to theopening region on the substrate between the opening region and each ofthe individual panel region.

An assembled panel is further provided in further another embodiment ofthe invention. The panel comprises a thin film transistor arraysubstrate comprising a thin film transistor array substrate comprisingat least one individual panel region; a color filter substratecomprising at least one individual panel region; a liquid crystal layerprovided between the individual panel region of the thin film transistorarray substrate and the individual panel region of the color filtersubstrate; a subsidiary sealant member provided on the periphery of theindividual panel region of the thin film transistor array substrate andthat of the individual panel region of the color filter substrate andprovided with at least one opening region; and a buffer provided on thethin film transistor array substrate or on the color filter substrateand corresponding to the opening region.

Further scope of applicability of the present invention will becomeapparent from the detailed description given hereinafter. However, itshould be understood that the detailed description and specificexamples, while indicating preferred embodiments of the invention, aregiven by way of illustration only, since various changes andmodifications within the spirit and scope of the invention will becomeapparent to those skilled in the art from the following detaileddescription.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will become more fully understood from thedetailed description given hereinafter and the accompanying drawingswhich are given by way of illustration only, and thus are not limitativeof the present invention and wherein:

FIG. 1 is a schematic view showing a conventional panel obtained byassembling a TFT array substrate and a color filter substrate;

FIG. 2 is a sectional view taken along a line A-A in FIG. 1;

FIG. 3 is a schematic view showing a color filter substrate employed asa substrate for liquid crystal display according to a first embodimentof the present invention;

FIG. 4 is a schematic view showing a TFT array substrate which is to bebonded with the color filter substrate shown in FIG. 3;

FIG. 5 is a schematic view showing a TFT array substrate employed as asubstrate for liquid crystal display according to the first embodimentof the present invention;

FIG. 6 is a schematic view showing a color filter substrate which is tobe bonded with the TFT array substrate shown in FIG. 5;

FIG. 7 is a schematic view showing a panel for liquid crystal displayafter assembling; and

FIG. 8 is a sectional view taken along a line B-B in FIG. 7;

FIG. 9 is a schematic view showing a procedure of assembling a colorfilter substrate provided with a buffer and a TFT array substrateaccording to a second embodiment of the present invention;

FIG. 10 is a schematic view showing a procedure of assembling a TFTarray substrate provided with a buffer and a color filter substrateaccording to the second embodiment of the present invention;

FIG. 11 is a schematic view showing an example of a panel after theassembling process according to the second embodiment of the presentinvention;

FIG. 12 is a schematic view showing another example of a panel after theassembling process according to the second embodiment of the presentinvention;

FIG. 13 is a schematic view showing still another example of a panelafter the assembling process according to the second embodiment of thepresent invention;

FIG. 14 is a schematic view showing still another example of a panelafter the assembling process according to the second embodiment of thepresent invention; and

FIG. 15 is a schematic view showing still another example of a panelafter the assembling process according to the second embodiment of thepresent invention.

DESCRIPTION OF THE EMBODIMENTS

The embodiments of the present invention will be described in detailhereinafter in conjunction with the drawings.

First Embodiment

A substrate for liquid crystal display and a manufacturing methodthereof are provided in the first embodiment of the invention to reducethe time spent in the assembling process and improve the efficiency ofthe cell process.

The substrate for liquid crystal display in the present embodimentcomprises a base substrate which comprises at least one individual panelregion. A subsidiary sealant member which is formed of a materialdifferent form that of the primary sealant member is provided on theperiphery of the individual panel region. At least one opening region isprovided on the subsidiary sealant member. Specifically, the subsidiarysealant member is used to maintain the cell thickness between twosubstrates after the two substrates are bonded together, and the openingregion provided on the subsidiary sealant member is helpful to airconvection so that the pressure inside the panel obtained by assemblingtwo substrates is close to or equal to that of the atmosphericenvironment.

Spacers may be further provided on the substrate and formed of the samematerial as that of the subsidiary sealant member. The spacers aremainly used to maintain the cell thickness after two substrates (i.e., acolor filter substrate and a TFT array substrate) are bonded together.Since the subsidiary sealant member and the spacers are formed of thesame material, they can be manufactured in a same process and thus themanufacturing efficiency can be improved. In addition, the buffer can beformed of the same material as that of the subsidiary sealant in thepresent embodiment, and thus the subsidiary sealant, the spacers and thebuffer can be manufactured in a same process (i.e., the TFT process orthe color filter process) and the manufacturing efficiency can befurther improved.

The buffer is provided on the substrate between the opening region andthe individual panel region and corresponds to the opening region. Byproviding the buffer corresponding to the opening regions of thesubsidiary sealant member, the airflows entering through the openingregions of the subsidiary sealant member after the panel, which has beenobtained by assembling the color filter substrate and the TFT arraysubstrate under a vacuum situation, is exposed to the atmosphere can bebuffered, and thus the impact force of the airflows to the primarysealant member is reduced. Therefore, the degraded display quality dueto bubbles resulting from the damage or breakage of the primary sealantby the impact force of the airflow is effectively prevented and theyield of the liquid crystal display is improved.

The method of manufacturing a substrate for liquid crystal display inthe present embodiment of the invention comprises the following steps:

forming at least one individual panel region on a base substrate; and

providing a subsidiary sealant member on the periphery of eachindividual panel region and providing at least one opening region on thesubsidiary sealant member.

Since the subsidiary sealant member with the at least one opening regionis provided on the periphery of the individual panel region, such membercan be used to maintain the cell thickness after two substrates areboned together. In addition, the subsidiary sealant member can bemanufactured in the process of manufacturing the substrate for liquidcrystal display (i.e., the TFT process or the color filter process), andthus the time spent in the assembling process is reduced and theefficiency of the cell process is improved. Therefore, the problem inthe conventional panel that the subsidiary sealant member is required tobe applied prior to the assembling of the color filter substrate and theTFT array substrate and thus the time spent in the assembling process isincreased can be solved.

A color filter substrate and a manufacturing method thereof will bedescribed hereinafter as examples of the embodiment.

As shown in FIG. 3, the color filter substrate 10 in the presentembodiment comprises at least one individual panel region 141, a primarysealant member 2 provided along the edges of the individual panel region141, a subsidiary sealant member 1 provided on the periphery of theindividual panel region 141, and at least one buffer 31. The subsidiarysealant member 1 has at least one opening region 12. The buffer 31 isprovided on the substrate and corresponds to the opening region 12 ofthe subsidiary sealant member 1. In addition, a black matrix, a colorfilter film for example forming the color filters of the primary colorsred, green and blue, spacers provided on the black matrix, a commonelectrode, an alignment film and the like are provided on the individualpanel region 141. The spacers may also be provided on the TFT arraysubstrate 11 shown in FIG. 4.

The buffer 31 is provided on the substrate between the opening region 12of the subsidiary sealant member 1 and each individual panel region 141and corresponds to the opening region 12. The buffer 31 is formed in astrip form and the lateral size thereof is larger than the size of theopening region 12. Furthermore, the buffer 31 is formed in the form ofone of a curve line, a fold line, a straight line and any combinationthereof. In addition, many other shapes (for example, the shapes of acorner, a semicircle, a parabola and the like) may be employed to formthe buffer 31 as long as the airflow entering through the opening region12 can be buffered. Specifically, with the buffer 31 with the shape of afold line, the peak of the angle rightly faces the opening region 12,and thus the airflow entering through the opening region 12 can beeffectively blocked and buffered as shown in FIG. 7. Furthermore, thesubsidiary sealant member 1 and the spacers 5 may be formed of the samematerial.

In addition, the subsidiary sealant member 1 or the spacers 5 or both ofthem may be formed on the TFT array substrate 11 that is to be bondedwith the color filter substrate 10.

In the present embodiment, the subsidiary sealant member 1 may be formedof the same material (for example, a photosensitive resin) as that ofthe spacers 5, and alternatively it may be formed of the materialdifferent from that of the spacers 5 and preferably formed of thematerial with a hardness larger than that of the primary sealant member2. Since the hardness and mechanical strength of the buffer 31 is largerthan that of the primary sealant member 2, the airflow entering throughthe opening region 12 can be more reliably blocked and buffered as shownin FIG. 7.

The buffer 31 in the present embodiment may be formed in a form of oneof a curve line, a fold line, a straight line and any combinationthereof and preferably formed as a fold line with an obtuse angle asshown in FIG. 3 and the peak of the obtuse angle rightly faces theopening region 12. Therefore, thus the airflows 13 entering through theopening region 12 even flow to the both sides of the buffer 31 as shownin FIG. 7, and thus the impact force of the airflows 13 is greatlyreduced, and the degraded display quality due to bubbles resulting fromthe damage or breakage of the sealant by the impact force of the airflowis effectively prevented.

As shown in FIG. 3 and FIG. 8, a method of manufacturing the colorfilter substrate comprises the following steps.

S1 of providing a black matrix 9, a color filter film 8, and a commonelectrode on each individual panel region on a substrate.

S2 of providing spacers 5 on the black matrix 9 and at the same timeproviding a subsidiary sealant member 1, the spacers 5 and a buffer 31on the substrate after the step S1.

The material layer for the spacers can be deposited on the substrateafter the step S1 and the spacers 5, the subsidiary sealant member 1 andthe buffer 31 can be formed of the same patterning process. In therelevant field, a patterning process generally comprises applyingphotoresist, using a mask to expose and develop the photoresist to forma pattern, etching an underlying layer with the pattern, removing theremaining photoresist pattern, and the like.

The subsidiary sealant member 1 is formed on the periphery of eachindividual panel region 141 and at least one opening region 12 isprovided on the subsidiary sealant member 1. The spacers 5 are formed onthe black matrix 9 and on the substrate between the subsidiary sealantmember 1 and each individual panel region 141. The buffer 31 is formedon the substrate between the opening region 12 and the individual panelregion 141 and corresponds to the opening region 12. The buffer 31 isformed in a strip form and the lateral size thereof is larger than thesize of the opening regions 12. The buffer 31 is formed in a form of oneof a curve line, a fold line, a straight line and any combinationthereof and in the present embodiment preferably formed as a fold linewith an obtuse angle as shown in FIG. 3, and the peak of the obtuseangle rightly faces the opening region 12;

The width at the bottom of the buffer 31 is about 1/20˜⅓ of the distancebetween the subsidiary sealant member 1 and the primary sealant member2, and the profile of the top of the buffer 31 is shaped as a circulararc. As shown in FIG. 8, the contact area between the buffer 31 with atop of a circular arc shape and the TFT array substrate 11 after bodingis reduced and thus the uniformity of the cell thickness can be moreeasily maintained.

S3 of forming an alignment film on the substrate after the step S2.

S4 of forming a primary sealant member 2 along the edges of theindividual panel region 141 on the substrate after the step S3 tosurround the individual panel region 141, so that the liquid crystalmaterial 6 dropped onto the individual panel region 141 in thesubsequent process is prevented from overflowing or being contaminated.

In addition, the primary sealant member 2 in the present embodiment maybe formed on the color filter substrate or on the TFT array substrate tobe bonded with the color filter substrate, and the spacers 5 and thesubsidiary sealant member 1 may also be formed on the TFT arraysubstrate 1.

A TFT array substrate and a manufacturing method thereof will bedescribed hereinafter as another example.

As shown in FIG. 5, the TFT array substrate 11 in the present embodimentcomprises at least one individual panel region 142, a primary sealantmember 2 provided on the edges of the individual panel region 142, asubsidiary sealant member 1 provided on the periphery of the individualpanel region 142 and at least one buffer 31. The subsidiary sealantmember 1 has at least one opening region 12. The buffer 31 is providedon the substrate and corresponds to the opening region 12 of thesubsidiary sealant member 1.

In addition, gate lines, a gate insulating layer, data lines, thin filmtransistors 7, a passivation layer, an alignment film, spacers and thelike are provided on the individual panel region 142. The spacers mayalso be provided on the color filter substrate 10. Modifications andvariations of the above gate lines, the gate insulating layer, datalines, thin film transistors, the passivation layer, the alignment filmand spacers may occur, and for example, the spacers may be formed on thecolor filter substrate 10 as shown in FIG. 6. But these modificationsand variations are still in the spirit of the invention.

The buffer 31 is formed on the substrate between the opening region 12and each individual panel region 142 and corresponds to the openingregion 142. The primary sealant member 2 is formed on the edges of eachindividual panel region 142. The lateral size of the buffer 31 is largerthan the size of the opening regions 12. The buffer 31, the subsidiarysealant member 1 and the spacers are formed of a same material. Thebuffer 31 is formed as one of a curve line, a fold line, a straight lineand any combination thereof.

In the present embodiment, the primary sealant member 2 may be formed onthe thin film transistor substrate or on the color filter substrate 10to be bonded with the TFT array substrate. The spacers 5 may also beformed on the color filter substrate 10.

An exemplary method of manufacturing the TFT array substrate in thepresent embodiment comprises the following steps.

A1 of forming gate electrodes, a gate insulating layer, data lines andthin film transistors on each individual panel region on a basesubstrate of glass.

A2 of forming a passivation layer on the gate electrodes, the gateinsulating layer, the data lines and the thin film transistors andforming via holes or trenches in the passivation layer.

A3 of forming a transparent pixel electrode on the passivation layer sothat the transparent pixel electrodes are formed and connected with thedrain electrodes of the thin film transistors through the via holes ortrenches in the passivation layer.

A4 of forming spacers shown in FIG. 8 on the passivation layer and atthe same time forming a subsidiary sealant member 1 and a buffer 31 onthe substrate.

Specifically, a material layer for the spacers is formed on thesubstrate after the step A3, and the spacers 5 shown in FIG. 8 areformed on the passivation layer above data lines by the patterningprocess. At the same time, the subsidiary sealant member 1 and thebuffer 31 are formed on the substrate. The subsidiary sealant member 1is formed on the periphery of each individual panel region 142 as shownin FIG. 5 and at least one opening region 12 is provided on thesubsidiary sealant member 1. The spacers 5 may be further formed on thesubstrate between the subsidiary sealant member 1 and the individualpanel region 142.

The buffer 31 is formed on the substrate between the opening region 12and the individual panel region 142 and corresponds to the openingregion 12. The width at the bottom of the buffer 31 is about 1/20˜⅓ ofthe distance between the subsidiary sealant member 1 and the primarysealant member 2, and the profile of the top of the buffer 31 is shapedas a circular arc.

A5 of forming an alignment film on the spacers on the substrate and onthe individual panel region 142 after the step A4.

A6 of forming a primary sealant member 2 shown in FIG. 5 on the edges ofthe individual panel region 142 on the substrate after the step A5 tosurround the individual panel region 142, so that the liquid crystalmaterial 6 in FIG. 8 dropped onto the individual panel region 142 in thesubsequent process is prevented from overflowing or being contaminated.

Second Embodiment

An assembled panel is provided in a second embodiment of the presentinvention. The assembled panel can be used to manufacture liquid crystaldisplays with a high yield.

As shown in FIG. 9 to FIG. 11, the assembled panel according to thepresent embodiment of the invention comprises a TFT array substrate 11comprising at least one individual panel region 142, a color filtersubstrate 10 comprising at least one individual panel region 141, aliquid crystal layer enclosed between the individual panel region 142 ofthe TFT array substrate 11 and the individual panel region 141 of thecolor filter substrate 10, a subsidiary sealant member 1 provided on theperiphery of the individual panel region 142 of the TFT array substrate11 and the periphery of the individual panel region 141 of the colorfilter substrate 10 and having at least one opening region 12, and atleast one buffer 31 provided on the TFT array substrate 11 or the colorfilter substrate 10 and corresponding to the opening region 12.Preferably, the hardness of the buffer 31 is larger than that of thesubsidiary sealant member 1.

As shown in FIG. 9 and FIG. 10, during the assembling process, thesubsidiary sealant member 1 is firstly applied on the TFT arraysubstrate 11 and then the TFT array substrate 11 is bonded with thecolor filter substrate 10; alternatively, the subsidiary sealant member1 is firstly applied on the color filter substrate 10 and then the colorfilter substrate 10 is bonded with the TFT array substrate 11.

In the assembled panel, the buffer provided on the TFT array substrateor the color filter substrate corresponds to the opening region of thesubsidiary sealant member and the hardness of the buffer is larger thanthat of the subsidiary sealant member, and thus the airflow enteringthrough the opening region of the subsidiary sealant member after thepanel is exposed to the atmosphere is effectively buffered, and theimpact force from the airflow is decreased. Therefore, a degradeddisplay quality due to bubbles resulting from the damage or breakage ofthe sealant member by the impact force of the airflow can be prevented,and thus the yield of the liquid crystal display is improved. Therefore,with the assembled panel provided in the present embodiment, the problemin the conventional panel that the display quality is degraded due tothe bubbles causing by the impact of the airflow can be solved.

As shown in FIG. 11 and FIG. 12, buffers 31, 32 are provided on theinside of the opening regions 12; as shown in FIG. 13, buffers 33 alsoare provided on the outside of the opening regions 12. In addition, thebuffers 33 may be further provided on the substrate on the inside andoutside of the opening regions 12 and the lateral size of the buffers 33is larger than the size of the opening regions 12, as shown in FIG. 13.In addition, as shown in FIG. 14 and FIG. 15, buffers 34, 35 areprovided extending through the opening regions 12. The widths at thebottom of the buffers 31, 32, 33 are set as about 1/20˜⅓ of the distancebetween the position of the subsidiary sealant member 1 and the positionof the primary sealant member 2. By this way, the attachment between thebottom of the buffer and the substrate can be reliably realized, and thearea of the substrate can be effectively utilized as well. In addition,the profile of the top of the buffer can be in a shape of circular arcor parabola, and preferably circular arc or parabola with a peak awayfrom the bottom of the buffer. With the reduced contact area between thetop of the buffer and the substrate, the number of the supports to thesubstrates is reduced so that the substrates are mainly supported by thespacers provided on the TFT array substrate 11 or the color filtersubstrate 10. Therefore, a more uniform cell thickness can be obtainedand maintained.

As shown in FIG. 11 and FIG. 12, the buffers 31, 32 are formed in astrip shape and the lateral size thereof is larger than the size of theopening regions 12, and thus the airflows 13 entering through theopening regions 12 can be effectively blocked and buffered as shown inFIG. 11. As shown in FIG. 9 or FIG. 10, spacers are further provided onthe TFT array substrate 11 or on the color filter substrate 10. Theheight of the buffers 31, 32 are larger than that of the spacers, andthe buffers 31, 32 are formed of the same material as that of thespacers. Furthermore, the material employed by the spacers has arelatively high hardness and mechanical stability and is widely used inthe field of liquid crystal display.

The buffers 32 in FIG. 12, the buffers 33 in FIG. 13, the buffers 34 inFIG. 14 and the buffers 35 in FIG. 15 are formed in a form of a curveline, a fold line, a straight line or a combination thereof, andpreferably formed as a fold line with an obtuse angle as shown in FIG.11. In the buffers 31 shown in FIG. 11, the peaks of the obtuse anglesconfront the opening regions 12, and thus the airflows 13 enteringthrough the opening regions 12 are even divided into two branches on theboth sides of the buffers 31. Therefore, the impact force of theairflows 13 is greatly reduced, and the degraded display quality due tobubbles resulting from the damage or breakage of the sealant by theimpact force of the airflow is effectively prevented.

With the assembled panel provided in the present embodiment, the impactforce of the airflows is reduced during the manufacturing process andthe degraded display quality due to bubbles resulting from the damage orbreakage of the sealant is prevented, and thus the assembled panel canbe used to manufacture the individual display panel with a high yieldand further to manufacture the liquid crystal display with a high yield.

It should be appreciated that the embodiments described above areintended to illustrate but not limit the present invention. Although thepresent invention has been described in detail herein with reference tothe preferred embodiments, it should be understood by those skilled inthe art that the present invention can be modified and some of thetechnical features can be equivalently substituted without departingfrom the spirit and scope of the present invention.

1. An assembled panel, comprising: a thin film transistor (TFT) arraysubstrate comprising at least one individual panel region; a colorfilter substrate comprising at least one individual panel region; aprimary sealant member provided along the edges of each of the at leastone individual panel region; a liquid crystal layer provided between theindividual panel region of the TFT array substrate and the individualpanel region of the color filter substrate; a subsidiary sealant memberprovided on the periphery of the individual panel region of the TFTarray substrate and that of the individual panel region of the colorfilter substrate and provided with at least one opening region; and abuffer provided on the TFT array substrate or on the color filtersubstrate and corresponding to the opening region, wherein the buffer isspaced apart from the subsidiary sealant member; wherein spacers areprovided on the TFT array substrate or the color filter, and thesubsidiary sealant member and the spacers are formed of a same material;and wherein the hardness of the buffer being larger than that of thesubsidiary sealant member.
 2. The assembled panel according to claim 1,wherein the buffer is provided on the inside and/or outside of theopening region of the subsidiary sealant member.
 3. The assembled panelaccording to claim 1, wherein the buffer is provided extending throughthe opening region of the subsidiary sealant member.
 4. The assembledpanel according to claim 1, wherein a lateral size of the buffer islarger than an aperture size of the opening region of the subsidiarysealant member.
 5. The assembled panel according to claim 1, wherein theheight of the buffer is larger than that of the spacers.
 6. Theassembled panel according to claim 5, wherein the buffer and the spacersare formed of a same material.
 7. The assembled panel according to claim1, wherein the buffer is formed as one of a curve line, a fold line, astraight line and any combination thereof.
 8. The assembled panelaccording to claim 1, wherein a width at the bottom of the buffer isabout 1/20˜⅓ of the distance between a position of the subsidiarysealant member and a position of a primary sealant member.
 9. Theassembled panel according to claim 1, wherein a profile of the top ofthe buffer is shaped as a circular arc or parabola.